Document Job Router and Runner Controller

Timo Furrerrequested to merge
job-router-and-admission-controller-docs into master

What does this MR do and why?

Document Job Router and Runner Controller

This change set adds the initial docs for the Job Router and the Runner (Admission) Controller and also adds a new tutorial for how to implement a Runner (Admission) Controller.

References

Refs gitlab-org/cluster-integration/gitlab-agent#796 (closed)

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